H74.311 (Ankylosis of ear ossicles, right ear) compared with H74.312 (Ankylosis of ear ossicles, left ear), from the official CMS tabular data. H74.311 and H74.312 code the same condition on opposite sides. MedCoder-derived
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. H74.311 and H74.312 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| H74.311Ankylosis of ear ossicles, right ear | H74.312Ankylosis of ear ossicles, left ear | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | H60-H95 — Diseases of the ear and mastoid process | H60-H95 — Diseases of the ear and mastoid process |
| Definition | Ankylosis of ear ossicles, right ear is a billable ICD-10-CM diagnosis code (H74.311). | Ankylosis of ear ossicles, left ear is a billable ICD-10-CM diagnosis code (H74.312). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources